Malicious PDF — malware analysis report

Static analysis result for SHA-256 2555e2757da69f97…

MALICIOUS

PDF

78.1 KB Created: 2020-03-25 02:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e791c4665e7091e2ae0de04bf9384e85 SHA-1: a352f534298472671c81a9cafb2b5cc70925ce4e SHA-256: 2555e2757da69f978a6b5f2733c2a0ecfb94ee7d633a4a076b90d59fffc78165
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which point to other PDFs hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates that this is a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content through a large number of seemingly innocuous links. The document body contains garbled text and a URL that appears to be a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://insurewithhoward.com/uploads/1/3/1/3/131378975/131378975.html#pasar+de+radianes+a+grados+formula
    • http://2-6mix.com/uploads/1/3/0/7/130776166/8738028.pdf
    • http://life4real.net/uploads/1/3/0/7/130776273/f867bec5726.pdf
    • http://www.giovane31.com/uploads/1/3/0/7/130776141/584022.pdf
    • http://msyearbook2014.com/uploads/1/3/0/5/130590186/dusimuzaz.pdf
    • http://edsands.com/uploads/1/3/0/2/130287976/d40929e627.pdf
    • http://precisionfashioninstruments.com/uploads/1/3/0/4/130489363/sotifatuxam_folasaludapup.pdf
    • http://isdtennis.com/uploads/1/3/0/8/130814286/2163721.pdf
    • http://johnsoncreative.org/uploads/1/3/0/4/130488500/zugegalibafag.pdf
    • http://ctatherapy.com/uploads/1/3/0/4/130435955/7526588.pdf
    • http://www.wordofnoise.com/uploads/1/3/0/6/130621721/03af7a401.pdf
    • http://julieeleanorart.com/uploads/1/3/0/4/130435848/7a8860fc1.pdf
    • http://haikuwithaview.org/uploads/1/3/0/5/130590163/8177225.pdf
    • http://goldenpoppybaby.com/uploads/1/3/0/4/130483772/xamal-rulupu-jepebofujeba-remalarogo.pdf
    • http://stlukeseucharist.org/uploads/1/3/0/4/130483566/8280504.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083e8.bin
4144c7c8f364083c4295dc543cada475cb0b4fa0a0f59580eadbf52577abd04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 12108 bytes
font_01_sfnt_off00009f56.bin
346a2bdd80125cfb2b885d2d4d38dd662344bc61ab2cd008f43a4df9f24832be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F56 12008 bytes
font_02_sfnt_off0000c601.bin
c134b4303e1cb01e400ea5a7e72ae24e8cac026df54aaa1f365eda9f0b0e22f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC601 2872 bytes
font_03_sfnt_off0000d000.bin
8e23e36d5a29bbcec21f0850b4a2a4314bdaf826c12d6f2303615f68a7405745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 11524 bytes
font_04_sfnt_off0000f5ac.bin
66b1328871eced7f8ad57dced787401bdac5c38925e4739a869aff86d47d4497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 19032 bytes
font_05_sfnt_off0001141d.bin
c83f72f7cbbb779e48a3e53237535cf9e376bad02af12ed6b8198d6483325a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 8076 bytes

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